treeview的某个节点默认为展开

先
tv_1.autoexpand:=true;
然后
currnode.selected:=true;
如：
var
itemcount:integer;
currnode:ttreenode;
begin
itemcount:=tv_1.items.count;
currnode:=tv_1.items[0];
for j:=1 to itemcount do
begin
if currnode.text=你要展开节点.text then
begin
currnode.selected:=true;
break;
end;
currnode:=currnode.getnext;
end;
end;